Instead of introducing a balancing mechanic, AWOL creates a third tier of removal, the absolutely-removed-from-the-freaking-game-forever zone. Let's be honest, though
Traditionally, Elsa alts have done very well in value to say the least, and that combined with this cards really cool effect should make this one of the more bankable Enchanted song cards of them all
It's a commonly played answer along with other blue defensive cards like Propaganda
I'd argue that if you were aiming for high powered EDH you really should throw them into your Ygra list
The part of Rancors second ability responsible for giving the +2/+0 bonus isnt concerned with when Humility entered the battlefield, because Humilitys effect sets the power/toughness values to 1/1, it is applied at layer 7b, and Rancors effect is applied at layer 7c, which is always after Humilitys effect
Trostani is all about making big tokens and generating a bunch of lifegain, often winning through alternate conditions like Aetherflux Reservoir or Felidar Sovereign